Challenge CHAMPION 305 Instructions And Parts Manual page 38

11.0 Hydraulic System
a. Open the left access door on front of the cutter.
b. Press the cut buttons while reading the pressure on the main system pressure gauge
(front gauge). The gauge should read approximately 1600 psi as the knife is moving
down (when bottomed, the gauge will jump to 1800 psi showing the Main System
Relief Pressure previously set).
c. If correct, proceed to check the Pressure Reducer.
To adjust:
a. Loosen the lock nut.
b. Make a cut and hold the buttons in. While reading the main system gauge, adjust the
valve until you have the correct pressure. Clockwise to increase, counter-clockwise to
decrease.
c. Once set, tighten the lock nut while holding the Allen wrench in place.
d. Proceed to readjust the other valves.
3. Clamp Up Sequence Valve (Figure 27)
This valve maintains clamp pressure so the clamp remains down until the knife has stopped in
the up position. Factory setting: 400-600 psi.
Check Procedure:
a. Open the left access door of the cutter.
b. Press the cut buttons, and while reading the pressure on the main gauge (front
gauge), release them. The gauge should read between 400-600 psi as the clamp is
going up. There should be no clamp movement until the knife is stopped in the up
position.
c. If correct, proceed to check the Pressure Reducer.
To Adjust:
a. Loosen the lock nut on the clamp up sequence valve.
b. Make a cut, then release the buttons. Read the main gauge as the clamp is
returning. Adjust the valve for a reading of 400-600 psi.
c. Once set, tighten the lock nut while holding the Allen wrench in place.
d. Proceed to readjust other valves.
4. Manual Pressure Reducer Valve-
This valve,(Figure 27), limits the amount of pressure to the clamp system. Factory setting: 1000 psi
(1400max/400min).
To Check:

With the hydraulic access door open, activate the cut buttons and read the pressure off
the clamp gauge (rear gauge). It should read 750 psi for average cutting purposes.
To Adjust:
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